Merge branch '5.4' into 6.0

* 5.4:
  [Cache] Add missing return type
  [5.2] Add missing `@return` annotations
  [4.4] Add missing `@return` annotations
  Handle lock with long key
  #42227 update phpdoc to recommend createIndex over ensureIndex

Author: nicolas-grekas

Form.php

@@ -329,6 +329,8 @@ public function offsetGet(mixed $name)
      * @param string       $name  The field name
      * @param string|array $value The value of the field
      *
+     * @return void
+     *
      * @throws \InvalidArgumentException if the field does not exist
      */
     public function offsetSet(mixed $name, mixed $value)
@@ -340,6 +342,8 @@ public function offsetSet(mixed $name, mixed $value)
      * Removes a field from the form.
      *
      * @param string $name The field name
+     *
+     * @return void
      */
     public function offsetUnset(mixed $name)
     {